//
//  UIButton+extension.swift
//  微博框架
//
//  Created by Dazayn on 16/8/4.
//  Copyright © 2016年 Dazayn. All rights reserved.
//

import UIKit

extension UIButton {

    //便利 构造函数
    convenience init(imageName: String, backImageName:String) {
        self.init()
        
        setImage(UIImage(named: imageName), forState: UIControlState.Normal)
        setImage(UIImage(named: imageName + "_highlighted"), forState: UIControlState.Highlighted)
        setBackgroundImage(UIImage(named: backImageName), forState: UIControlState.Normal)
        setBackgroundImage(UIImage(named: backImageName), forState: UIControlState.Highlighted)
        
        //会根据背景图片的大小调整尺寸
        sizeToFit()
        
    }
    
    
    
}
